Because we traveled constantly when I was under 5, I don't have reference points for many memories. I do have little 'photos' in my head of events and places.... some of which my mother explained.
Most of them were after I turned 3. I don't know of any I can pin down at 2½. My parents took photos, but none of them when I was under 3 are part of my internal storage.

My coordinated, connected memories begin when we moved to New Orleans in 1945 so I could start school. Before that it was just snapshots. I do remember riding on a train during WWII to Kansas City to meet my uncle who was coming home. I don't remember getting ON the train or actually meeting my uncle, but there was a soldier on the train who would smoke a cigarette way down, then catch the butt in a fold of his tongue and fold it into his mouth and blow smoke out his nose. I'm told that was when I was just over 3.

   I know exactly where I was when FDR died, because my father's crew was in Dalhart, Texas, and my mother & I were standing in a railroad yard when an engineer told my mother something and she started crying.... but I was already just under 6 then.

Funny, but given the great number of miles the family spent in the car, moving from place to place, I don't remember any car rides...maybe I slept.

(Oh... my father was a Western Union Lineman whose crew set poles and strung telegraph lines from the 1930s to 1945... from Wyoming to Texas. I was born in Denver in May of 1939)